Tester



FIG. 1 is a front elevational view of a tester showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a top, front and right side perspective view thereof; and,

FIG. 8 is a top, front and right side perspective view showing the tester in an open state.

The broken lines in the drawings illustrate portions of the tester which form no part of the claimed design. 

CLAIM The ornamental design for a tester, as shown and described. 